Volume slider gone.

Hello everyone.

My very old installation of Windows 7 64 did not have a volume slider for Flash. I made it work by doing a complete uninstall of Flash down to removing the files from the system32 and systemWOW64 per the tutorials about it.

Since then I have upgraded to 8.1 64 and this has repeated itself. As you can see here I have a slider for each program, including any current game I may be playing, but not for Flash. I have tried to uninstall Flash three times with the program this site provides, and then remove the files as the tutorial shows, but despite installing the most current version one time, the debug version another, and finally a special 18 version the volume slider has still to reappear.

Unfortunately It means I need to lower the sound from Firefox, which means Youtube is affected. What am I missing and what could I do to have that Flash volume slider show up again?